Snap to face not working
When set to median and face as target an objects median (center) will snap to a face.
This example shows how snapping works with different objects and snapping an edge of the same object.



When you use closest as snapping target then objects will snap to the top of the face.



Snapping doesn't work by pressing Enter by itself.

Using Face|Closest|Project individual elements on the surface of others you can achieve the following results but you should press g before pressing Enter.